That definition definitely looks odd. The correct EPSG id for System 34 Sjælland is 10250 (and its companion for the western part of Denmark, "System 34 Jylland" is EPSG:10160).
For historical reasons, those systems are utterly odd: They originated as cadastral systems, and the cadastre did not really care about the absolute orientation of the systems, hence ignoring (at that time, i.e. 1930-ish), existing astro-geodetic observations, to the effect that what was specified as a transverse cylinder projection actually ended up as oblique. Which also means, as noted by Mikael Rittri a decade ago on this mailing list, that System 34 can be approximated at the metre level by an oblique mercator (proj=omerc). The reconstructions we recently submitted to the EPSG, are based on transverse mercator, but use grid based datum shifts to correct for the mis-orientation and network tensions. Den tirs. 15. aug. 2023 kl. 00.18 skrev Javier Jimenez Shaw < [email protected]>: > Hi > > I got this wkt, which projection "Transverse Mercator Sjaelland" is not > supported by PROJ > > PROJCS["Danish_System_34_Sjaelland", GEOGCS["GCS_European 1950", > DATUM["D_European 1950", > SPHEROID["International_1924",6378388.000000,297.000000]], > PRIMEM["Greenwich",0.000000], UNIT["Degree",0.017453292519943295]], > PROJECTION["Transverse Mercator Sjaelland"], > PARAMETER["Scale_Factor",0.999600], > PARAMETER["Central_Meridian",9.000000], > PARAMETER["False_Easting",500000.000000], UNIT["Meter",1.000000000000]] > > Seems to be something very Danish specific, and quite old. Do you know any > equivalent wkt that may work in PROJ? There were some Danish grid files > added recently for S34 > > Thanks > Javier > .___ ._ ..._ .. . ._. .___ .. __ . _. . __.. ... .... ._ .__ > _______________________________________________ > PROJ mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/proj >
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